package com.example.countrycode;

import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;

import java.lang.reflect.Method;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        readNvRAMFile();
        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }



    private byte[] readNvRAMFile() {
        try {
            Class<?> ServiceManagerClassObject = Class.forName("android.os.ServiceManager");
            Method getService = ServiceManagerClassObject.getDeclaredMethod("getService", String.class);
            getService.setAccessible(true);
            Object result = getService.invoke(ServiceManagerClassObject, "NvRAMAgent");

            IBinder binder = (IBinder) result;
            if (binder == null) {
                Log.e("readNvRAMFile", "NvRAMAgent service  not available");
                return null;
            }
            NvRAMAgent mNvRAMService = NvRAMAgent.Stub.asInterface(binder) ;
            if (mNvRAMService == null) {
                Log.e("readNvRAMFile", "NvRAMAgent object is null");
                return null;
            }
            try {
                return mNvRAMService.readFileByName("WIFI");
            } catch (RemoteException e) {
                Log.e("readNvRAMFile", "readFileByName fail RemoteException", e);
                e.printStackTrace();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}
